Segmental grinding wheel



March 3, 1936. w. c. HERMAN 2,032,362

- SEGMENTAL GRINDING WHEEL Filed A ril 25, 1954 [NVE/VTOI? MM Mm,

94 A flag,

44; ATTORNEY Patented Mar. 3, 1936 UNITED STATES PATENT OFFICE 2,032,362 SEGMENTAL GRINDING WHEEL Wallace 0. Herman, oakwood, Ohio, assignor to The Carborundum Company, Niagara Falls, N. Y., a corporation of Pennsylvania Application April 23,1934, Serial No. 721,958

4 Claims. (01. 51-206).

I hexagonal shape so that they will engage the face surface of the stone with their points first. The edges of the abrasive blocks then cut their way through the surface of the stone by a shearing action. A solid grinding wheel, on the other hand, engages the surface of the stone with a braking action, without producing a shear of any kind.

Another object of the inventionis to provide a grinding wheel which, because of the abrasiveinserts it carries, will require materially less power to operate, since there is much less surface in contact with the stone than is the case when a solid wheel is used. In fact, where my grinding wheel is employed, the feed is approximately twice as much with the same power consumption as with the 'old type of wheel. Withal, my grinding wheel shears its way through the surface of the stone or the object being finished with greater efilciency and less power consumption.

In the accompanying drawing illustrating my invention, Figure 1 is a perspective view of my improved grinding wheel, showing the abrasiveinserts therein. Figure 2 is an end view of the same. And Figure 3 is a longitudinal sectional view taken through the center thereof.

Referring to the accompanying drawing for a detailed description of my invention, the numeral l designates a cast iron drum whose ends are closed by hub discs 2 and 3. Provided in the periphery of the drum l are spaced dove tailed pockets or sockets 4 which receive abrasiveinserts 5 preferably of hexagonal shape. These abrasive blocks are inserted in their tapered sockets 4, which are cast in the drum, by dropping them in those sockets and then lead around them} These abrasive blocks are so positioned by their sockets, when fixed within them, as to engage, first with their points and then with their edges, the surface of the stone to finish it-with a shearing action.

pouring molten The arrangement of the abrasive blocks 5 is also such that a line drawn circumferentially around the drum at any point between the centers of the extreme end blocks will pass through an equal linear surface of abrasive, thereby causing 5 the wheel to wear straight. From the centers of the extreme end abrasive blocks to the edges of the drum, there is purposely provided less linear inches of abrasive in order that the drum will wear slightly more on its extreme ends, there- 10 by preventing an overlap of the wheel from showing on the finished work.

It will now be seen that my grinding wheel, whoseabrasive-inserts make an edge conta'ct'with the surface of the object to be finished, is rotated with less power and performs its work with greater efiiciency than the present solid type of wheel.

Having described my invention, I claim:

1. A grinding wheel comprising a metal drum,. 20

and spaced and staggered abrasive-inserts attached to the periphery of said drum, said abrasive-inserts being so spaced and so staggered that a line drawn circumferentially around the drum at any point between the centers of the extreme 25 end inserts, will pass through the same linear surface of abrasives as any other line similarly drawn.

2. A grinding wheel comprising a metal drum formed with spaced and staggered tapered sockets so in its periphery, and hexagonal abrasive inserts" fixed in the sockets in the drum for projection beyond its periphery to engage a surface to be 1 finished.

3. A grinding wheel comprising a metaldrum 36' formed with spaced and staggered, tapered sock-- .ets in its periphery, and hexagonal abrasiveinserts fixed in said sockets, said inserts being positioned by said sockets to engage a surface first by their points andthen with their edges to 40 shear their way across said surface.

4. A grinding wheel comprising a metal drum formed with spaced and staggered tapered sockets in its periphery, and hexagonal abrasive inserts f xed in the sockets in the drum for projection beyond its periphery, said abrasive insertsb'eing so spaced and so staggered that a line drawn circumferentially around the drum. at any point between the centers of the extreme end inserts will pass through the same linear surface of abrav sives as any other line similarly drawn.

WALLACE C. HERMAN. 

